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Citroen C3 Key Fob Replacement If your C3 key fob suddenly stopped functioning, it could be due to an issue with the module. If the key fob is functional, the issue may be due to something else, such as water damage or a dead coin battery. Citroen intends to cater to the market of mass appeal with its eC3. It offers several facilities like remote diagnostics that can be performed remotely and a dedicated customer support application. Dead coin battery If the unlock button on the key fob does not work, it could mean that the battery in the coin is not working properly. The battery is expected to last between three and four years with regular use, but it can die unexpectedly. Fortunately, most car manufacturers have built-in fail-safes to ensure that you are able to unlock and start your car even if your key fob is dead battery. The battery inside the key fob is secured with clips made of metal, which complete the circuit. If they're worn or dirty, the battery will not receive electricity. The battery should be of the correct size and type. If the battery is too small or too large it won't fit into the fob and will not perform as expected. Key fob batteries are sold under many names like CR2016 or CR2032. They cannot be interchanged. Consult your owner's guide or look for a label on the fob that contains the information. If you've found the right battery and it's replaced, it's possible to replace it in a matter of seconds. Most fobs feature a slider, switch, or gap that you can use to pry open the cover and exchange the original battery for an alternative. Make sure that the new battery is of the same voltage and that it is placed in the correct direction. Water damage Even even if your key fob has survived the wash cycle or a dip in the pool, water isn't good for electronics. It can damage batteries and cause significant damage to the electronic chip inside. There are several things you can do to reduce the damage. It's crucial to first eliminate the battery and then dry the inside as possible. You can also use a cotton swab dipped in 90-percent isopropyl alcohol to clean the battery as well as the circuit board. After you've cleaned the key fob, wait for a few days to completely dry. You can speed it by placing it on a shelf so that it won't get disturbed. Once you're sure that it is bone dry, try putting in a brand new battery and operating it in the same way as you normally would. If the key fob still doesn't work, you may have a defective receiver module that isn't able to transmit signals to your car. It's expensive to fix, but it's worth it if your goal isn't to replace your vehicle. The easiest way to fix a broken key fob is to replace the battery. The radio signal will be restored and your key fob will function again after replacing the battery. If the problem continues, you should seek assistance from a professional. Faulty receiver module In certain cases an issue with the receiver module of the key fob might stop it from receiving or transmitting proper signals. If this is the situation, your car will not recognize your remote control key, and will not allow you to unlock or start the engine. In this case an alternative remote control will be required. Refer to the owner's manual prior to trying to reprogram the key fob on your own. First, make sure that the battery in the key fob is in good shape and that all buttons are functioning. Close the doors and remove any other devices from the aftermarket, such as alarms or radios from the vehicle. You can also clean the chip using isopropyl or electronic cleaner. If the chip is fried, you will have to replace it. After cleaning the key fob, take it off the circuit board. Clean the contacts with alcohol swabs and let them dry. Once the contacts have dried you can reassemble them and test the key fob. If it's not working, you may need to replace the battery. Make sure you choose the latest battery that has the same voltage as your old one. It is recommended to make sure the battery is in correctly because the contact points can be extremely sensitive. A malfunctioning keyless entry system The key fob is a wonderful convenience for cars however it can be frustrating when it stops working. G28 's generally easy to get your key fob back working. The most common cause of a malfunctioning key fob is a dead coin battery, which is easily replaced in a matter of minutes. Other causes are signal interference or a defective module, as well as other electrical problems. The first step is to ensure that the battery is correctly installed and has the correct voltage. It is also crucial to select the correct battery type. The internal circuitry of the device could be damaged by using a battery that is not the correct size or one that is not polarized. Examine the fuses to determine if they are damaged or been melted. Another possible problem is that the transponder contained in the key might have been damaged or lost. This is a problem that requires further examination by a car dealer or professional mechanic. Many dealerships and auto locksmiths can reprogram the key fob of a car for a small fee, but it can be costly. It may be worth it to reprogram your spare fob if you have one. In the majority of cases, you will get instructions from your owner's guide. If you don't have the manual you can search for instructions online or on YouTube. Before you attempt to repair the key fob, it's vital to refer to the owner's manual.